Receptacle-to-conduit-attaching fitting.



APPLICATION FILED DEC. 3. !BH.

Patente @at 22, 19M.

, entran sentirne earns-1r cierren FREDERICK J. RAVLIN ,AND JOHN LOFGREN, OF CHICAGO, ILLINOIS.

RECEPTACL-TO-CONDUIT-ATTACHING FITTING.

Patented @et 22, 19118.

Applicationed December 3, 1914. Serial No. 875,277.

To all whom it may concern.'

Be it known that we, FREDERICK J. RAVLIN and JOHN LoreRnN, citizens of the United States, both .residing at Chicago, in .the county of Cook and State of Illinois, have invented certain new and useful Improvem'nts in Receptacle-toConduit-Attaching Fittings, of which the following is a specificatio Our invention relates to improvements in receptacles-toconduit attaching fitting, that is to say coupling devices by which a hollow receptacle or the like may be attached, for support, to an electrical conduit. One 0f the objects of our invention is to provide a lconstruction whereby the installation of Aelectriral appliances, to be served by the conduit-carried wire, may be facilitated by construction enabling theI receptacle and portions of the coupling to be loosely positioned on the conduit, out of: the way of its extremity, while the base portion of.

the coupling, (with respect to which the electrical appliances will be positioned), is properly attached to the conduit end and is easily accessible.

A further object of our invention is to provide a construction that. will. be weather proof, making a non-leaking joint between the receptacle and conduit, through-the attaching device.

Still another object of our invention is to provide a construction that insures adaptability of the coupling` structure to surface inequalities of thereceptacle, and provide such coupling surfaces for cooperation with receptacle as will prevent injury to the latter, so that the coupling may advantageously'be used in connection with enameledwarereceptacles and the like, the surfaces of which are liable to damage.

In the drawings, wherein is illustrated an embodiment vof our invention, in the single form of a coupling especially adapted for attachment of an enameled lamp shade, having a deep lamp-socket-receiving receptacle,

to the lamp wire carrying conduit, l

Figure 1 is a vertieaLsectional view with parts in elevation;

Fig. 2 is a vertical section with parts in elevation, showing the parts disassembled;

'Fig 3 is a transverse section on line 3 3 of Fig. 1; and

Fig. et is a detail suggesting the character of the enameled receptacle.

In the drawings 10 indicates in general a lamp shade of a well known construction, often made of enameled steel, and having an extended receptacle-portion or throat 11, terminating in a top wall 12 that has a central aperture 13 for attachment of the receptacle structure to a suitable 'conduit 14. I/Vhile we do not intend to limit-our invention to use with this particular form of receptacle or attached device, except so far as the same may b e specifically noted in the claim, our invention may be very advantageously. employed in effecting connectionI between such a device and its conduit.

The conduit 14 is externally screw threaded as at 15l and for threaded connection therewith is provided a base 16, preferably of disk form, having a-tubular extension 17 thatI is eXteriorly threaded as at 18, the interior of the tubular structure having a thread 15 that extends axially clear through the base. Where, as in the construction shown, auxiliary electrical devices, such as a lamp socket'base 20, are to be secured to the base 16, threaded apertures 21 to receive the attaching screws 22, may be provided in the and the nut may, of course, be screwed down.

to exert any desired tension.

Y IVe prefer that yielding means, adapted when under pressure closely to conform to the clamped surface of thereceptacle top 12, be interposed between said. receptacle top and the clamping means, and in the particular construction shown such packing structures are provided both belowl and above the 'top portion 12 of the receptacle. SpecificallyA 26 indicates an annular washer interposed between the bearing annulus of the disk 16 and the under side ofthe receptacle wall 12, said packing washer being formed of relatively soft material, preferably elastic and water resisting., Specifically such washer may be made of prepared cork so that under compression."it will readily conform to any inequalities in the wall 12 of the receptacle and will vieldingly take up applied pressure so that if the receptacle be enamelled the enamel majrv not be cracked or marred under pressure.

Likewise, above the receptacle Wall 12 there lis preferably provided a washer 27, capable of adapting' itself to the surface of the receptacle and preferably `made of lead,

.and guarded by a superimposed hard metal washer 28, of steel or the like, topreserve it against the grinding' action of the nut In setting,r a fixture, such as the receptacle 11 and its contained lamp base 20, the nut 25, washers 28 and Q7 and receptacle 11 are slipped upon the conduit 14, as suggested in Fig. 2, sufficiently far to be out of the way. The base structure 16, carrying the corl washer 26, is then screwed into place and supplies, in exposed position, the connecting structure with'respect to which the parts to be Wired are located. The lamp socket section 2O may accordingly be easily placed in position and Wired with the greatest facility, after which the receptacle 11 is lowered into place, surrounding stein 17, the upper 'Washers 27 and 28 are positioned thereon and the Vnut' 25 'is screwed home.- Owing to the yielding packing' employed, slight deviations from true surface in the top wall 1Q of the receptacle are compensated for and no undue pressure is applied at high points on the surface 12 crack the enamel. The upper and 1 lower yielding washe s, adapting themselves to the that, otherwise, would tend to receptacle, make a watertight joint between the respective parts so that deterioration' from rust is minimized and leakage of moisture into the receptacle is prevented.

Having thus described our invention, what' we claun 1stthe conduit, and a lamp socket; of a fitting I comprising' a body part having' a stem internali)v threaded for engagement with the threaded end of the conduit, and externally flfrcaded for engagement by a clamping nut, a hase portion on the lower end of the stem extending radially thereheyond and affordinte bearing on its uppr surface to support the receptacle, a clamping nut engaging the external threads of the stem above the receptacle andl affording opposing bearing t0 clamp the receptacle against the base portion. of the fittingr aud screw .fastening means taking; through the lamp socket insulating hase from the lower end thereof' into the upper side of the fitting' base and within the socket easing'.

l'n testimony whereof we hereunto set our hands. l

FR El ICRIUK J. RAVLN. {H )llN LOFGREN.

In the, presence of- (uo. 'l`. MM', Jr., Maur F. ALLEN. 

